Discover where Hollywood's hottest stars ate, drank, partied and slept during Comic-Con 2012 in San Diego.

The star-studded festivities began Wednesday night with a kickoff celebration for The Twilight Saga: Breaking Dawn -- Part 2 atop Float at the Hard Rock Hotel with Summit Entertainment. In attendance were Elizabeth Reaser, Peter Facinelli, Ashley Greene, Amadou Ly, Nikki Reed, Maggie Grace and Casey LaBow, among many others.

On Thursday night, ‘Con celebs got the party started at FLUXX. Spotted at the Gaslamp nightclub were Kellan Lutz from Twilight and John Rezig from “True Blood.”

To the delight of fans, ‘Iron Man’ Robert Downey, Jr. made a surprise cameo during the Marvel Studios panel at ‘Con. Iron Man’s downtown pad of choice was the luxe Star Suite at the Andaz Hotel, and he was spotted having dinner and drinks at the hotel’s restaurant Katsuya on Friday.

Also shacking up at the Andaz was Fifty Shades of Grey author E L James, who stayed in the Sweet Suite.

Down the street, The US Grant Hotel welcomed many high-profile guests for the weekend, including Tim Burton, Connor Cruise (without newly divorced dad in sight), and Ellen Pompeo of “Grey’s Anatomy” who, funny enough, wasn’t in town for Comic-Con. But rather, for a trip to the San Diego Zoo. Spotted in the hotel’s Grant Grill restaurant were “Dexter” stud Michael C. Hall and Elijah Wood.

The hilarious comedian / screenwriter Seth MacFarlane was spotted atop Ivy Rooftop at the Andaz Hotel on Friday night. His drink of choice? JD and coke. Music producer turned film director RZA (Wu-Tang Clan) was also seen in a Cabana Suite.

More celebrities spotted at the Maxim, FX and Fox Home Entertainment party Friday at the Andaz include Elijah Wood, Ian Somerhalder, Nina Dobrev and Paul Wesley from “The Vampire Diaries,” Billy Burke from “Twilight,” and Colton Hayes and Holland Roden from “Teen Wolf.” Also on the scene were “It’s Always Sunny in Philadelphia” funnymen Glen Howerton, Rob McElhenney and Charlie Day.

Another hot ticket on Friday night was the Warner Bros. Television party atop Float at the Hard Rock Hotel, featuring cast and creators of major series “The Vampire Diaries,” “The Big Bang Theory” and “Revolution.” The Hard Rock continued to heat up with major stars all weekend, with the Lionsgate / IGN The Expendables 2 party on Thursday, and the Entertainment Weekly / Ubisoft party on Saturday.

Quality Social was a top choice for Comic-Con celebrities this weekend. On Friday night, Ashley Green and Anna Kendrick from Twilight, Kristen Bauer von Straten from “True Blood,” and Magic Mike hottie Joe Manganiello posed for photos with fans and sipped ‘Con-inspired cocktails. Also seen at Q.S. was comedian and “Community” star Joel McHale, along with co-stars Gillian Jacobs, Yvette Nicole Brown and Allison Brie. And that’s not all; Lucy Lawless from “Xena: Warrior Princess,” Dave Franco of “Scrubs,” and Ben Lyons of E! Television all stopped by Q.S. for drinks and good times.